use Archimedes’ principle to calculate the volume (in m3) of helium needed if a helium balloon is to lift a load of 161 kg? (NB: Ignore the weight of the balloon; take the mass density of air and helium as 1.737 kg/m3 and 0.11kg/m3 respectively.)

Acharge q experiences no net force at a particular point in space. which of the following situations described below must always be true? -there are no other charges nearby. -if there are other charges nearby, they must all have the same sign as q. -if there are other charges nearby, they must all have the opposite sign of q. -if there are other charges nearby, the total positive charge must equal the total negative charge. -none of the above